When PHPUnit is installed in a production environment via composer and
these modules are in a web accessible directory, the eval-stdin.php file
in PHPUnit contains vulnerable statements that trigger the vulnerability.

Impact

A remote attacker could possibly execute arbitrary PHP code or cause a
Denial of Service condition.

Workaround

There are several ways to fix or mitigate this vulnerability:Remove PHPUnit from the production environment.Update PHPUnit.Manually apply the patch.Disable direct access to the composer packages by placing .htaccess file
to /vendor folder.